Troubleshooting
Korean feather reed grass problems — and how to fix them
Korean feather reed grass (Calamagrostis brachytricha) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Rust fungus
Orange pustules can appear in humid, crowded conditions; improve airflow between clumps and avoid wetting foliage when watering.
Flopping in shade
In deep shade or very fertile, moist soils stems may arch or flop; a slightly sunnier position or restraint on fertiliser keeps the clump more upright.
Dead centre
Mature clumps die out in the middle after several years; divide every 3-4 years in early spring to refresh vigour.
Prevent korean feather reed grass problems before they start
Most korean feather reed grass issues are care-mismatch, not bad luck. Dial in the basics:
Looking for korean feather reed grass in general rather than its problems? Read the full korean feather reed grass care guide — light, water, soil and feeding.
Korean feather reed grass problems — FAQ
Why is my korean feather reed grass rust fungus?
Orange pustules can appear in humid, crowded conditions; improve airflow between clumps and avoid wetting foliage when watering.
Why is my korean feather reed grass flopping in shade?
In deep shade or very fertile, moist soils stems may arch or flop; a slightly sunnier position or restraint on fertiliser keeps the clump more upright.
Why is my korean feather reed grass dead centre?
Mature clumps die out in the middle after several years; divide every 3-4 years in early spring to refresh vigour.